Show that M indeed is a reflection. To do this, you need to find a (nonzero) column vector v such that Mv = v, another (nonzero) column vector w such that Mw=-w, and you need v and w to be perpendicular to each other. (This shows that M gives reflection across the line spanned by v, or in other words, Rv is the line of symmetry. Your job is to find v and w.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section9.8: Determinants
Problem 24E
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I need help with the second bullet point in d
cos
and
sin 0
simple and memorable form for the inverse.)
sin 0
une nonzero),
(6
(All but the first of these is a "special kind of matrix" and there is a
090).
(d) Consider the matrix M
-
Cos 0
sin 0
0
(13) (3) (
cos
sin 0
It is a fact that this gives counter-
cos (
(c) Consider the matrix M =
clockwise rotation around the origin by angle 0. On the basis of this fact, thinking geomet-
rically, what should the inverse matrix be? Explain how this agrees with your calculation in
(b) (using elementary trigonometry).
- sin
sin 0
- cos 0
utrices:
cos 0
sin 0
(e)
Going back to (b):
-
• (i 3¹); is a rotation. What is the angle? Sino
1
1
2
3 4
- sin 0
Cos 0
It is a fact that this is reflection
Sing-Co
across a a line.
. What should the inverse of a reflection be? Explain how this agrees with your answer
in (b).
Show that M indeed is a reflection. To do this, you need to find a (nonzero) column
vector v such that My = v, another (nonzero) column vector w such that Mw = -w, and
you need v and w to be perpendicular to each other. (This shows that M gives reflection
across the line spanned by v, or in other words, Rv is the line of symmetry. Your job is to
find v and w.
Transcribed Image Text:cos and sin 0 simple and memorable form for the inverse.) sin 0 une nonzero), (6 (All but the first of these is a "special kind of matrix" and there is a 090). (d) Consider the matrix M - Cos 0 sin 0 0 (13) (3) ( cos sin 0 It is a fact that this gives counter- cos ( (c) Consider the matrix M = clockwise rotation around the origin by angle 0. On the basis of this fact, thinking geomet- rically, what should the inverse matrix be? Explain how this agrees with your calculation in (b) (using elementary trigonometry). - sin sin 0 - cos 0 utrices: cos 0 sin 0 (e) Going back to (b): - • (i 3¹); is a rotation. What is the angle? Sino 1 1 2 3 4 - sin 0 Cos 0 It is a fact that this is reflection Sing-Co across a a line. . What should the inverse of a reflection be? Explain how this agrees with your answer in (b). Show that M indeed is a reflection. To do this, you need to find a (nonzero) column vector v such that My = v, another (nonzero) column vector w such that Mw = -w, and you need v and w to be perpendicular to each other. (This shows that M gives reflection across the line spanned by v, or in other words, Rv is the line of symmetry. Your job is to find v and w.
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